Martin, the manager for Adidas store in Glendale mall indicates that customers spend in the store an average of 15 mins with a standard deviation of 5 minutes. The lengths of time spent in the store is normally distributed and are represented by the variable X.

1. Find the probability if a customer spends less than 14 minutes in the store.
2. Find the probability if a customer spends between 17 to 20 minutes in the store.
3. Find the probability if a customer spends more than 19 minutes in the store.
4. If 100 customers enter the store, how many shoppers would you expect to be in the store for each interval of time listed above (1-3)?